.timeline {
    position: relative;
    height: 50px;
    background-color: #333;
    margin: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    height: 4px;
    background-color: #666;
    top: 20px;
    left: 0;
    right: 0;
}

.event {
    position: absolute;
    top: 0;
    width: 0;
    text-align: center;
    color: white;
}

.marker {
    width: 10px;
    height: 10px;
    background-color: #00f;
    border-radius: 50%;
    margin: 0 auto;
    position: relative;
    top: 15px;
}

.label {
    margin-top: 5px;
    font-size: 12px;
}